1/* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) 9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk) 10 */ 11#include <linux/module.h> 12#include <linux/moduleparam.h> 13#include <linux/capability.h> 14#include <linux/errno.h> 15#include <linux/types.h> 16#include <linux/socket.h> 17#include <linux/in.h> 18#include <linux/slab.h> 19#include <linux/kernel.h> 20#include <linux/sched.h> 21#include <linux/timer.h> 22#include <linux/string.h> 23#include <linux/sockios.h> 24#include <linux/net.h> 25#include <linux/stat.h> 26#include <net/ax25.h> 27#include <linux/inet.h> 28#include <linux/netdevice.h> 29#include <linux/if_arp.h> 30#include <linux/skbuff.h> 31#include <net/net_namespace.h> 32#include <net/sock.h> 33#include <asm/uaccess.h> 34#include <asm/system.h> 35#include <linux/fcntl.h> 36#include <linux/termios.h> /* For TIOCINQ/OUTQ */ 37#include <linux/mm.h> 38#include <linux/interrupt.h> 39#include <linux/notifier.h> 40#include <net/netrom.h> 41#include <linux/proc_fs.h> 42#include <linux/seq_file.h> 43#include <net/ip.h> 44#include <net/tcp_states.h> 45#include <net/arp.h> 46#include <linux/init.h> 47 48static int nr_ndevs = 4; 49 50int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; 51int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; 52int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; 53int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; 54int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; 55int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; 56int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; 57int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; 58int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; 59int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; 60int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; 61int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; 62 63static unsigned short circuit = 0x101; 64 65static HLIST_HEAD(nr_list); 66static DEFINE_SPINLOCK(nr_list_lock); 67 68static const struct proto_ops nr_proto_ops; 69 70/* 71 * NETROM network devices are virtual network devices encapsulating NETROM 72 * frames into AX.25 which will be sent through an AX.25 device, so form a 73 * special "super class" of normal net devices; split their locks off into a 74 * separate class since they always nest. 75 */ 76static struct lock_class_key nr_netdev_xmit_lock_key; 77static struct lock_class_key nr_netdev_addr_lock_key; 78 79static void nr_set_lockdep_one(struct net_device *dev, 80 struct netdev_queue *txq, 81 void *_unused) 82{ 83 lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key); 84} 85 86static void nr_set_lockdep_key(struct net_device *dev) 87{ 88 lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key); 89 netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL); 90} 91 92/* 93 * Socket removal during an interrupt is now safe. 94 */ 95static void nr_remove_socket(struct sock *sk) 96{ 97 spin_lock_bh(&nr_list_lock); 98 sk_del_node_init(sk); 99 spin_unlock_bh(&nr_list_lock); 100} 101 102/* 103 * Kill all bound sockets on a dropped device. 104 */ 105static void nr_kill_by_device(struct net_device *dev) 106{ 107 struct sock *s; 108 struct hlist_node *node; 109 110 spin_lock_bh(&nr_list_lock); 111 sk_for_each(s, node, &nr_list) 112 if (nr_sk(s)->device == dev) 113 nr_disconnect(s, ENETUNREACH); 114 spin_unlock_bh(&nr_list_lock); 115} 116 117/* 118 * Handle device status changes. 119 */ 120static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 121{ 122 struct net_device *dev = (struct net_device *)ptr; 123 124 if (!net_eq(dev_net(dev), &init_net)) 125 return NOTIFY_DONE; 126 127 if (event != NETDEV_DOWN) 128 return NOTIFY_DONE; 129 130 nr_kill_by_device(dev); 131 nr_rt_device_down(dev); 132 133 return NOTIFY_DONE; 134} 135 136/* 137 * Add a socket to the bound sockets list. 138 */ 139static void nr_insert_socket(struct sock *sk) 140{ 141 spin_lock_bh(&nr_list_lock); 142 sk_add_node(sk, &nr_list); 143 spin_unlock_bh(&nr_list_lock); 144} 145 146/* 147 * Find a socket that wants to accept the Connect Request we just 148 * received. 149 */ 150static struct sock *nr_find_listener(ax25_address *addr) 151{ 152 struct sock *s; 153 struct hlist_node *node; 154 155 spin_lock_bh(&nr_list_lock); 156 sk_for_each(s, node, &nr_list) 157 if (!ax25cmp(&nr_sk(s)->source_addr, addr) && 158 s->sk_state == TCP_LISTEN) { 159 bh_lock_sock(s); 160 goto found; 161 } 162 s = NULL; 163found: 164 spin_unlock_bh(&nr_list_lock); 165 return s; 166} 167 168/* 169 * Find a connected NET/ROM socket given my circuit IDs. 170 */ 171static struct sock *nr_find_socket(unsigned char index, unsigned char id) 172{ 173 struct sock *s; 174 struct hlist_node *node; 175 176 spin_lock_bh(&nr_list_lock); 177 sk_for_each(s, node, &nr_list) { 178 struct nr_sock *nr = nr_sk(s); 179 180 if (nr->my_index == index && nr->my_id == id) { 181 bh_lock_sock(s); 182 goto found; 183 } 184 } 185 s = NULL; 186found: 187 spin_unlock_bh(&nr_list_lock); 188 return s; 189} 190 191/* 192 * Find a connected NET/ROM socket given their circuit IDs. 193 */ 194static struct sock *nr_find_peer(unsigned char index, unsigned char id, 195 ax25_address *dest) 196{ 197 struct sock *s; 198 struct hlist_node *node; 199 200 spin_lock_bh(&nr_list_lock); 201 sk_for_each(s, node, &nr_list) { 202 struct nr_sock *nr = nr_sk(s); 203 204 if (nr->your_index == index && nr->your_id == id && 205 !ax25cmp(&nr->dest_addr, dest)) { 206 bh_lock_sock(s); 207 goto found; 208 } 209 } 210 s = NULL; 211found: 212 spin_unlock_bh(&nr_list_lock); 213 return s; 214} 215 216/* 217 * Find next free circuit ID. 218 */ 219static unsigned short nr_find_next_circuit(void) 220{ 221 unsigned short id = circuit; 222 unsigned char i, j; 223 struct sock *sk; 224 225 for (;;) { 226 i = id / 256; 227 j = id % 256; 228 229 if (i != 0 && j != 0) { 230 if ((sk=nr_find_socket(i, j)) == NULL) 231 break; 232 bh_unlock_sock(sk); 233 } 234 235 id++; 236 } 237 238 return id; 239} 240 241/* 242 * Deferred destroy. 243 */ 244void nr_destroy_socket(struct sock *); 245 246/* 247 * Handler for deferred kills. 248 */ 249static void nr_destroy_timer(unsigned long data) 250{ 251 struct sock *sk=(struct sock *)data; 252 bh_lock_sock(sk); 253 sock_hold(sk); 254 nr_destroy_socket(sk); 255 bh_unlock_sock(sk); 256 sock_put(sk); 257} 258 259/* 260 * This is called from user mode and the timers. Thus it protects itself 261 * against interrupt users but doesn't worry about being called during 262 * work. Once it is removed from the queue no interrupt or bottom half 263 * will touch it and we are (fairly 8-) ) safe. 264 */ 265void nr_destroy_socket(struct sock *sk) 266{ 267 struct sk_buff *skb; 268 269 nr_remove_socket(sk); 270 271 nr_stop_heartbeat(sk); 272 nr_stop_t1timer(sk); 273 nr_stop_t2timer(sk); 274 nr_stop_t4timer(sk); 275 nr_stop_idletimer(sk); 276 277 nr_clear_queues(sk); /* Flush the queues */ 278 279 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 280 if (skb->sk != sk) { /* A pending connection */ 281 /* Queue the unaccepted socket for death */ 282 sock_set_flag(skb->sk, SOCK_DEAD); 283 nr_start_heartbeat(skb->sk); 284 nr_sk(skb->sk)->state = NR_STATE_0; 285 } 286 287 kfree_skb(skb); 288 } 289 290 if (sk_has_allocations(sk)) { 291 /* Defer: outstanding buffers */ 292 sk->sk_timer.function = nr_destroy_timer; 293 sk->sk_timer.expires = jiffies + 2 * HZ; 294 add_timer(&sk->sk_timer); 295 } else 296 sock_put(sk); 297} 298 299/* 300 * Handling for system calls applied via the various interfaces to a 301 * NET/ROM socket object. 302 */ 303 304static int nr_setsockopt(struct socket *sock, int level, int optname, 305 char __user *optval, unsigned int optlen) 306{ 307 struct sock *sk = sock->sk; 308 struct nr_sock *nr = nr_sk(sk); 309 int opt; 310 311 if (level != SOL_NETROM) 312 return -ENOPROTOOPT; 313 314 if (optlen < sizeof(int)) 315 return -EINVAL; 316 317 if (get_user(opt, (int __user *)optval)) 318 return -EFAULT; 319 320 switch (optname) { 321 case NETROM_T1: 322 if (opt < 1) 323 return -EINVAL; 324 nr->t1 = opt * HZ; 325 return 0; 326 327 case NETROM_T2: 328 if (opt < 1) 329 return -EINVAL; 330 nr->t2 = opt * HZ; 331 return 0; 332 333 case NETROM_N2: 334 if (opt < 1 || opt > 31) 335 return -EINVAL; 336 nr->n2 = opt; 337 return 0; 338 339 case NETROM_T4: 340 if (opt < 1) 341 return -EINVAL; 342 nr->t4 = opt * HZ; 343 return 0; 344 345 case NETROM_IDLE: 346 if (opt < 0) 347 return -EINVAL; 348 nr->idle = opt * 60 * HZ; 349 return 0; 350 351 default: 352 return -ENOPROTOOPT; 353 } 354} 355 356static int nr_getsockopt(struct socket *sock, int level, int optname, 357 char __user *optval, int __user *optlen) 358{ 359 struct sock *sk = sock->sk; 360 struct nr_sock *nr = nr_sk(sk); 361 int val = 0; 362 int len; 363 364 if (level != SOL_NETROM) 365 return -ENOPROTOOPT; 366 367 if (get_user(len, optlen)) 368 return -EFAULT; 369 370 if (len < 0) 371 return -EINVAL; 372 373 switch (optname) { 374 case NETROM_T1: 375 val = nr->t1 / HZ; 376 break; 377 378 case NETROM_T2: 379 val = nr->t2 / HZ; 380 break; 381 382 case NETROM_N2: 383 val = nr->n2; 384 break; 385 386 case NETROM_T4: 387 val = nr->t4 / HZ; 388 break; 389 390 case NETROM_IDLE: 391 val = nr->idle / (60 * HZ); 392 break; 393 394 default: 395 return -ENOPROTOOPT; 396 } 397 398 len = min_t(unsigned int, len, sizeof(int)); 399 400 if (put_user(len, optlen)) 401 return -EFAULT; 402 403 return copy_to_user(optval, &val, len) ? -EFAULT : 0; 404} 405 406static int nr_listen(struct socket *sock, int backlog) 407{ 408 struct sock *sk = sock->sk; 409 410 lock_sock(sk); 411 if (sk->sk_state != TCP_LISTEN) { 412 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); 413 sk->sk_max_ack_backlog = backlog; 414 sk->sk_state = TCP_LISTEN; 415 release_sock(sk); 416 return 0; 417 } 418 release_sock(sk); 419 420 return -EOPNOTSUPP; 421} 422 423static struct proto nr_proto = { 424 .name = "NETROM", 425 .owner = THIS_MODULE, 426 .obj_size = sizeof(struct nr_sock), 427}; 428 429static int nr_create(struct net *net, struct socket *sock, int protocol, 430 int kern) 431{ 432 struct sock *sk; 433 struct nr_sock *nr; 434 435 if (!net_eq(net, &init_net)) 436 return -EAFNOSUPPORT; 437 438 if (sock->type != SOCK_SEQPACKET || protocol != 0) 439 return -ESOCKTNOSUPPORT; 440 441 sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto); 442 if (sk == NULL) 443 return -ENOMEM; 444 445 nr = nr_sk(sk); 446 447 sock_init_data(sock, sk); 448 449 sock->ops = &nr_proto_ops; 450 sk->sk_protocol = protocol; 451 452 skb_queue_head_init(&nr->ack_queue); 453 skb_queue_head_init(&nr->reseq_queue); 454 skb_queue_head_init(&nr->frag_queue); 455 456 nr_init_timers(sk); 457 458 nr->t1 = 459 msecs_to_jiffies(sysctl_netrom_transport_timeout); 460 nr->t2 = 461 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 462 nr->n2 = 463 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 464 nr->t4 = 465 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 466 nr->idle = 467 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 468 nr->window = sysctl_netrom_transport_requested_window_size; 469 470 nr->bpqext = 1; 471 nr->state = NR_STATE_0; 472 473 return 0; 474} 475 476static struct sock *nr_make_new(struct sock *osk) 477{ 478 struct sock *sk; 479 struct nr_sock *nr, *onr; 480 481 if (osk->sk_type != SOCK_SEQPACKET) 482 return NULL; 483 484 sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot); 485 if (sk == NULL) 486 return NULL; 487 488 nr = nr_sk(sk); 489 490 sock_init_data(NULL, sk); 491 492 sk->sk_type = osk->sk_type; 493 sk->sk_priority = osk->sk_priority; 494 sk->sk_protocol = osk->sk_protocol; 495 sk->sk_rcvbuf = osk->sk_rcvbuf; 496 sk->sk_sndbuf = osk->sk_sndbuf; 497 sk->sk_state = TCP_ESTABLISHED; 498 sock_copy_flags(sk, osk); 499 500 skb_queue_head_init(&nr->ack_queue); 501 skb_queue_head_init(&nr->reseq_queue); 502 skb_queue_head_init(&nr->frag_queue); 503 504 nr_init_timers(sk); 505 506 onr = nr_sk(osk); 507 508 nr->t1 = onr->t1; 509 nr->t2 = onr->t2; 510 nr->n2 = onr->n2; 511 nr->t4 = onr->t4; 512 nr->idle = onr->idle; 513 nr->window = onr->window; 514 515 nr->device = onr->device; 516 nr->bpqext = onr->bpqext; 517 518 return sk; 519} 520 521static int nr_release(struct socket *sock) 522{ 523 struct sock *sk = sock->sk; 524 struct nr_sock *nr; 525 526 if (sk == NULL) return 0; 527 528 sock_hold(sk); 529 sock_orphan(sk); 530 lock_sock(sk); 531 nr = nr_sk(sk); 532 533 switch (nr->state) { 534 case NR_STATE_0: 535 case NR_STATE_1: 536 case NR_STATE_2: 537 nr_disconnect(sk, 0); 538 nr_destroy_socket(sk); 539 break; 540 541 case NR_STATE_3: 542 nr_clear_queues(sk); 543 nr->n2count = 0; 544 nr_write_internal(sk, NR_DISCREQ); 545 nr_start_t1timer(sk); 546 nr_stop_t2timer(sk); 547 nr_stop_t4timer(sk); 548 nr_stop_idletimer(sk); 549 nr->state = NR_STATE_2; 550 sk->sk_state = TCP_CLOSE; 551 sk->sk_shutdown |= SEND_SHUTDOWN; 552 sk->sk_state_change(sk); 553 sock_set_flag(sk, SOCK_DESTROY); 554 break; 555 556 default: 557 break; 558 } 559 560 sock->sk = NULL; 561 release_sock(sk); 562 sock_put(sk); 563 564 return 0; 565} 566 567static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 568{ 569 struct sock *sk = sock->sk; 570 struct nr_sock *nr = nr_sk(sk); 571 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 572 struct net_device *dev; 573 ax25_uid_assoc *user; 574 ax25_address *source; 575 576 lock_sock(sk); 577 if (!sock_flag(sk, SOCK_ZAPPED)) { 578 release_sock(sk); 579 return -EINVAL; 580 } 581 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 582 release_sock(sk); 583 return -EINVAL; 584 } 585 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 586 release_sock(sk); 587 return -EINVAL; 588 } 589 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 590 release_sock(sk); 591 return -EINVAL; 592 } 593 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 594 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); 595 release_sock(sk); 596 return -EADDRNOTAVAIL; 597 } 598 599 /* 600 * Only the super user can set an arbitrary user callsign. 601 */ 602 if (addr->fsa_ax25.sax25_ndigis == 1) { 603 if (!capable(CAP_NET_BIND_SERVICE)) { 604 dev_put(dev); 605 release_sock(sk); 606 return -EACCES; 607 } 608 nr->user_addr = addr->fsa_digipeater[0]; 609 nr->source_addr = addr->fsa_ax25.sax25_call; 610 } else { 611 source = &addr->fsa_ax25.sax25_call; 612 613 user = ax25_findbyuid(current_euid()); 614 if (user) { 615 nr->user_addr = user->call; 616 ax25_uid_put(user); 617 } else { 618 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 619 release_sock(sk); 620 dev_put(dev); 621 return -EPERM; 622 } 623 nr->user_addr = *source; 624 } 625 626 nr->source_addr = *source; 627 } 628 629 nr->device = dev; 630 nr_insert_socket(sk); 631 632 sock_reset_flag(sk, SOCK_ZAPPED); 633 dev_put(dev); 634 release_sock(sk); 635 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); 636 return 0; 637} 638 639static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 640 int addr_len, int flags) 641{ 642 struct sock *sk = sock->sk; 643 struct nr_sock *nr = nr_sk(sk); 644 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 645 ax25_address *source = NULL; 646 ax25_uid_assoc *user; 647 struct net_device *dev; 648 int err = 0; 649 650 lock_sock(sk); 651 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 652 sock->state = SS_CONNECTED; 653 goto out_release; /* Connect completed during a ERESTARTSYS event */ 654 } 655 656 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 657 sock->state = SS_UNCONNECTED; 658 err = -ECONNREFUSED; 659 goto out_release; 660 } 661 662 if (sk->sk_state == TCP_ESTABLISHED) { 663 err = -EISCONN; /* No reconnect on a seqpacket socket */ 664 goto out_release; 665 } 666 667 sk->sk_state = TCP_CLOSE; 668 sock->state = SS_UNCONNECTED; 669 670 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 671 err = -EINVAL; 672 goto out_release; 673 } 674 if (addr->sax25_family != AF_NETROM) { 675 err = -EINVAL; 676 goto out_release; 677 } 678 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 679 sock_reset_flag(sk, SOCK_ZAPPED); 680 681 if ((dev = nr_dev_first()) == NULL) { 682 err = -ENETUNREACH; 683 goto out_release; 684 } 685 source = (ax25_address *)dev->dev_addr; 686 687 user = ax25_findbyuid(current_euid()); 688 if (user) { 689 nr->user_addr = user->call; 690 ax25_uid_put(user); 691 } else { 692 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 693 dev_put(dev); 694 err = -EPERM; 695 goto out_release; 696 } 697 nr->user_addr = *source; 698 } 699 700 nr->source_addr = *source; 701 nr->device = dev; 702 703 dev_put(dev); 704 nr_insert_socket(sk); /* Finish the bind */ 705 } 706 707 nr->dest_addr = addr->sax25_call; 708 709 release_sock(sk); 710 circuit = nr_find_next_circuit(); 711 lock_sock(sk); 712 713 nr->my_index = circuit / 256; 714 nr->my_id = circuit % 256; 715 716 circuit++; 717 718 /* Move to connecting socket, start sending Connect Requests */ 719 sock->state = SS_CONNECTING; 720 sk->sk_state = TCP_SYN_SENT; 721 722 nr_establish_data_link(sk); 723 724 nr->state = NR_STATE_1; 725 726 nr_start_heartbeat(sk); 727 728 /* Now the loop */ 729 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 730 err = -EINPROGRESS; 731 goto out_release; 732 } 733 734 /* 735 * A Connect Ack with Choke or timeout or failed routing will go to 736 * closed. 737 */ 738 if (sk->sk_state == TCP_SYN_SENT) { 739 DEFINE_WAIT(wait); 740 741 for (;;) { 742 prepare_to_wait(sk_sleep(sk), &wait, 743 TASK_INTERRUPTIBLE); 744 if (sk->sk_state != TCP_SYN_SENT) 745 break; 746 if (!signal_pending(current)) { 747 release_sock(sk); 748 schedule(); 749 lock_sock(sk); 750 continue; 751 } 752 err = -ERESTARTSYS; 753 break; 754 } 755 finish_wait(sk_sleep(sk), &wait); 756 if (err) 757 goto out_release; 758 } 759 760 if (sk->sk_state != TCP_ESTABLISHED) { 761 sock->state = SS_UNCONNECTED; 762 err = sock_error(sk); /* Always set at this point */ 763 goto out_release; 764 } 765 766 sock->state = SS_CONNECTED; 767 768out_release: 769 release_sock(sk); 770 771 return err; 772} 773 774static int nr_accept(struct socket *sock, struct socket *newsock, int flags) 775{ 776 struct sk_buff *skb; 777 struct sock *newsk; 778 DEFINE_WAIT(wait); 779 struct sock *sk; 780 int err = 0; 781 782 if ((sk = sock->sk) == NULL) 783 return -EINVAL; 784 785 lock_sock(sk); 786 if (sk->sk_type != SOCK_SEQPACKET) { 787 err = -EOPNOTSUPP; 788 goto out_release; 789 } 790 791 if (sk->sk_state != TCP_LISTEN) { 792 err = -EINVAL; 793 goto out_release; 794 } 795 796 /* 797 * The write queue this time is holding sockets ready to use 798 * hooked into the SABM we saved 799 */ 800 for (;;) { 801 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 802 skb = skb_dequeue(&sk->sk_receive_queue); 803 if (skb) 804 break; 805 806 if (flags & O_NONBLOCK) { 807 err = -EWOULDBLOCK; 808 break; 809 } 810 if (!signal_pending(current)) { 811 release_sock(sk); 812 schedule(); 813 lock_sock(sk); 814 continue; 815 } 816 err = -ERESTARTSYS; 817 break; 818 } 819 finish_wait(sk_sleep(sk), &wait); 820 if (err) 821 goto out_release; 822 823 newsk = skb->sk; 824 sock_graft(newsk, newsock); 825 826 /* Now attach up the new socket */ 827 kfree_skb(skb); 828 sk_acceptq_removed(sk); 829 830out_release: 831 release_sock(sk); 832 833 return err; 834} 835 836static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 837 int *uaddr_len, int peer) 838{ 839 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 840 struct sock *sk = sock->sk; 841 struct nr_sock *nr = nr_sk(sk); 842 843 lock_sock(sk); 844 if (peer != 0) { 845 if (sk->sk_state != TCP_ESTABLISHED) { 846 release_sock(sk); 847 return -ENOTCONN; 848 } 849 sax->fsa_ax25.sax25_family = AF_NETROM; 850 sax->fsa_ax25.sax25_ndigis = 1; 851 sax->fsa_ax25.sax25_call = nr->user_addr; 852 memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater)); 853 sax->fsa_digipeater[0] = nr->dest_addr; 854 *uaddr_len = sizeof(struct full_sockaddr_ax25); 855 } else { 856 sax->fsa_ax25.sax25_family = AF_NETROM; 857 sax->fsa_ax25.sax25_ndigis = 0; 858 sax->fsa_ax25.sax25_call = nr->source_addr; 859 *uaddr_len = sizeof(struct sockaddr_ax25); 860 } 861 release_sock(sk); 862 863 return 0; 864} 865 866int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 867{ 868 struct sock *sk; 869 struct sock *make; 870 struct nr_sock *nr_make; 871 ax25_address *src, *dest, *user; 872 unsigned short circuit_index, circuit_id; 873 unsigned short peer_circuit_index, peer_circuit_id; 874 unsigned short frametype, flags, window, timeout; 875 int ret; 876 877 skb->sk = NULL; /* Initially we don't know who it's for */ 878 879 /* 880 * skb->data points to the netrom frame start 881 */ 882 883 src = (ax25_address *)(skb->data + 0); 884 dest = (ax25_address *)(skb->data + 7); 885 886 circuit_index = skb->data[15]; 887 circuit_id = skb->data[16]; 888 peer_circuit_index = skb->data[17]; 889 peer_circuit_id = skb->data[18]; 890 frametype = skb->data[19] & 0x0F; 891 flags = skb->data[19] & 0xF0; 892 893 /* 894 * Check for an incoming IP over NET/ROM frame. 895 */ 896 if (frametype == NR_PROTOEXT && 897 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 898 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 899 skb_reset_transport_header(skb); 900 901 return nr_rx_ip(skb, dev); 902 } 903 904 /* 905 * Find an existing socket connection, based on circuit ID, if it's 906 * a Connect Request base it on their circuit ID. 907 * 908 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 909 * circuit that no longer exists at the other end ... 910 */ 911 912 sk = NULL; 913 914 if (circuit_index == 0 && circuit_id == 0) { 915 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 916 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 917 } else { 918 if (frametype == NR_CONNREQ) 919 sk = nr_find_peer(circuit_index, circuit_id, src); 920 else 921 sk = nr_find_socket(circuit_index, circuit_id); 922 } 923 924 if (sk != NULL) { 925 skb_reset_transport_header(skb); 926 927 if (frametype == NR_CONNACK && skb->len == 22) 928 nr_sk(sk)->bpqext = 1; 929 else 930 nr_sk(sk)->bpqext = 0; 931 932 ret = nr_process_rx_frame(sk, skb); 933 bh_unlock_sock(sk); 934 return ret; 935 } 936 937 /* 938 * Now it should be a CONNREQ. 939 */ 940 if (frametype != NR_CONNREQ) { 941 /* 942 * Here it would be nice to be able to send a reset but 943 * NET/ROM doesn't have one. We've tried to extend the protocol 944 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 945 * apparently kills BPQ boxes... :-( 946 * So now we try to follow the established behaviour of 947 * G8PZT's Xrouter which is sending packets with command type 7 948 * as an extension of the protocol. 949 */ 950 if (sysctl_netrom_reset_circuit && 951 (frametype != NR_RESET || flags != 0)) 952 nr_transmit_reset(skb, 1); 953 954 return 0; 955 } 956 957 sk = nr_find_listener(dest); 958 959 user = (ax25_address *)(skb->data + 21); 960 961 if (sk == NULL || sk_acceptq_is_full(sk) || 962 (make = nr_make_new(sk)) == NULL) { 963 nr_transmit_refusal(skb, 0); 964 if (sk) 965 bh_unlock_sock(sk); 966 return 0; 967 } 968 969 window = skb->data[20]; 970 971 skb->sk = make; 972 make->sk_state = TCP_ESTABLISHED; 973 974 /* Fill in his circuit details */ 975 nr_make = nr_sk(make); 976 nr_make->source_addr = *dest; 977 nr_make->dest_addr = *src; 978 nr_make->user_addr = *user; 979 980 nr_make->your_index = circuit_index; 981 nr_make->your_id = circuit_id; 982 983 bh_unlock_sock(sk); 984 circuit = nr_find_next_circuit(); 985 bh_lock_sock(sk); 986 987 nr_make->my_index = circuit / 256; 988 nr_make->my_id = circuit % 256; 989 990 circuit++; 991 992 /* Window negotiation */ 993 if (window < nr_make->window) 994 nr_make->window = window; 995 996 /* L4 timeout negotiation */ 997 if (skb->len == 37) { 998 timeout = skb->data[36] * 256 + skb->data[35]; 999 if (timeout * HZ < nr_make->t1) 1000 nr_make->t1 = timeout * HZ; 1001 nr_make->bpqext = 1; 1002 } else { 1003 nr_make->bpqext = 0; 1004 } 1005 1006 nr_write_internal(make, NR_CONNACK); 1007 1008 nr_make->condition = 0x00; 1009 nr_make->vs = 0; 1010 nr_make->va = 0; 1011 nr_make->vr = 0; 1012 nr_make->vl = 0; 1013 nr_make->state = NR_STATE_3; 1014 sk_acceptq_added(sk); 1015 skb_queue_head(&sk->sk_receive_queue, skb); 1016 1017 if (!sock_flag(sk, SOCK_DEAD)) 1018 sk->sk_data_ready(sk, skb->len); 1019 1020 bh_unlock_sock(sk); 1021 1022 nr_insert_socket(make); 1023 1024 nr_start_heartbeat(make); 1025 nr_start_idletimer(make); 1026 1027 return 1; 1028} 1029 1030static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, 1031 struct msghdr *msg, size_t len) 1032{ 1033 struct sock *sk = sock->sk; 1034 struct nr_sock *nr = nr_sk(sk); 1035 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; 1036 int err; 1037 struct sockaddr_ax25 sax; 1038 struct sk_buff *skb; 1039 unsigned char *asmptr; 1040 int size; 1041 1042 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1043 return -EINVAL; 1044 1045 lock_sock(sk); 1046 if (sock_flag(sk, SOCK_ZAPPED)) { 1047 err = -EADDRNOTAVAIL; 1048 goto out; 1049 } 1050 1051 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1052 send_sig(SIGPIPE, current, 0); 1053 err = -EPIPE; 1054 goto out; 1055 } 1056 1057 if (nr->device == NULL) { 1058 err = -ENETUNREACH; 1059 goto out; 1060 } 1061 1062 if (usax) { 1063 if (msg->msg_namelen < sizeof(sax)) { 1064 err = -EINVAL; 1065 goto out; 1066 } 1067 sax = *usax; 1068 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1069 err = -EISCONN; 1070 goto out; 1071 } 1072 if (sax.sax25_family != AF_NETROM) { 1073 err = -EINVAL; 1074 goto out; 1075 } 1076 } else { 1077 if (sk->sk_state != TCP_ESTABLISHED) { 1078 err = -ENOTCONN; 1079 goto out; 1080 } 1081 sax.sax25_family = AF_NETROM; 1082 sax.sax25_call = nr->dest_addr; 1083 } 1084 1085 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); 1086 1087 /* Build a packet - the conventional user limit is 236 bytes. We can 1088 do ludicrously large NetROM frames but must not overflow */ 1089 if (len > 65536) { 1090 err = -EMSGSIZE; 1091 goto out; 1092 } 1093 1094 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); 1095 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1096 1097 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1098 goto out; 1099 1100 skb_reserve(skb, size - len); 1101 skb_reset_transport_header(skb); 1102 1103 /* 1104 * Push down the NET/ROM header 1105 */ 1106 1107 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1108 SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); 1109 1110 /* Build a NET/ROM Transport header */ 1111 1112 *asmptr++ = nr->your_index; 1113 *asmptr++ = nr->your_id; 1114 *asmptr++ = 0; /* To be filled in later */ 1115 *asmptr++ = 0; /* Ditto */ 1116 *asmptr++ = NR_INFO; 1117 SOCK_DEBUG(sk, "Built header.\n"); 1118 1119 /* 1120 * Put the data on the end 1121 */ 1122 skb_put(skb, len); 1123 1124 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); 1125 1126 /* User data follows immediately after the NET/ROM transport header */ 1127 if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) { 1128 kfree_skb(skb); 1129 err = -EFAULT; 1130 goto out; 1131 } 1132 1133 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); 1134 1135 if (sk->sk_state != TCP_ESTABLISHED) { 1136 kfree_skb(skb); 1137 err = -ENOTCONN; 1138 goto out; 1139 } 1140 1141 nr_output(sk, skb); /* Shove it onto the queue */ 1142 1143 err = len; 1144out: 1145 release_sock(sk); 1146 return err; 1147} 1148 1149static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, 1150 struct msghdr *msg, size_t size, int flags) 1151{ 1152 struct sock *sk = sock->sk; 1153 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; 1154 size_t copied; 1155 struct sk_buff *skb; 1156 int er; 1157 1158 /* 1159 * This works for seqpacket too. The receiver has ordered the queue for 1160 * us! We do one quick check first though 1161 */ 1162 1163 lock_sock(sk); 1164 if (sk->sk_state != TCP_ESTABLISHED) { 1165 release_sock(sk); 1166 return -ENOTCONN; 1167 } 1168 1169 /* Now we can treat all alike */ 1170 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { 1171 release_sock(sk); 1172 return er; 1173 } 1174 1175 skb_reset_transport_header(skb); 1176 copied = skb->len; 1177 1178 if (copied > size) { 1179 copied = size; 1180 msg->msg_flags |= MSG_TRUNC; 1181 } 1182 1183 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1184 1185 if (sax != NULL) { 1186 sax->sax25_family = AF_NETROM; 1187 skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, 1188 AX25_ADDR_LEN); 1189 } 1190 1191 msg->msg_namelen = sizeof(*sax); 1192 1193 skb_free_datagram(sk, skb); 1194 1195 release_sock(sk); 1196 return copied; 1197} 1198 1199 1200static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1201{ 1202 struct sock *sk = sock->sk; 1203 void __user *argp = (void __user *)arg; 1204 int ret; 1205 1206 switch (cmd) { 1207 case TIOCOUTQ: { 1208 long amount; 1209 1210 lock_sock(sk); 1211 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1212 if (amount < 0) 1213 amount = 0; 1214 release_sock(sk); 1215 return put_user(amount, (int __user *)argp); 1216 } 1217 1218 case TIOCINQ: { 1219 struct sk_buff *skb; 1220 long amount = 0L; 1221 1222 lock_sock(sk); 1223 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1224 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1225 amount = skb->len; 1226 release_sock(sk); 1227 return put_user(amount, (int __user *)argp); 1228 } 1229 1230 case SIOCGSTAMP: 1231 lock_sock(sk); 1232 ret = sock_get_timestamp(sk, argp); 1233 release_sock(sk); 1234 return ret; 1235 1236 case SIOCGSTAMPNS: 1237 lock_sock(sk); 1238 ret = sock_get_timestampns(sk, argp); 1239 release_sock(sk); 1240 return ret; 1241 1242 case SIOCGIFADDR: 1243 case SIOCSIFADDR: 1244 case SIOCGIFDSTADDR: 1245 case SIOCSIFDSTADDR: 1246 case SIOCGIFBRDADDR: 1247 case SIOCSIFBRDADDR: 1248 case SIOCGIFNETMASK: 1249 case SIOCSIFNETMASK: 1250 case SIOCGIFMETRIC: 1251 case SIOCSIFMETRIC: 1252 return -EINVAL; 1253 1254 case SIOCADDRT: 1255 case SIOCDELRT: 1256 case SIOCNRDECOBS: 1257 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1258 return nr_rt_ioctl(cmd, argp); 1259 1260 default: 1261 return -ENOIOCTLCMD; 1262 } 1263 1264 return 0; 1265} 1266 1267#ifdef CONFIG_PROC_FS 1268 1269static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1270{ 1271 spin_lock_bh(&nr_list_lock); 1272 return seq_hlist_start_head(&nr_list, *pos); 1273} 1274 1275static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1276{ 1277 return seq_hlist_next(v, &nr_list, pos); 1278} 1279 1280static void nr_info_stop(struct seq_file *seq, void *v) 1281{ 1282 spin_unlock_bh(&nr_list_lock); 1283} 1284 1285static int nr_info_show(struct seq_file *seq, void *v) 1286{ 1287 struct sock *s = sk_entry(v); 1288 struct net_device *dev; 1289 struct nr_sock *nr; 1290 const char *devname; 1291 char buf[11]; 1292 1293 if (v == SEQ_START_TOKEN) 1294 seq_puts(seq, 1295"user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n"); 1296 1297 else { 1298 1299 bh_lock_sock(s); 1300 nr = nr_sk(s); 1301 1302 if ((dev = nr->device) == NULL) 1303 devname = "???"; 1304 else 1305 devname = dev->name; 1306 1307 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1308 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1309 seq_printf(seq, 1310"%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n", 1311 ax2asc(buf, &nr->source_addr), 1312 devname, 1313 nr->my_index, 1314 nr->my_id, 1315 nr->your_index, 1316 nr->your_id, 1317 nr->state, 1318 nr->vs, 1319 nr->vr, 1320 nr->va, 1321 ax25_display_timer(&nr->t1timer) / HZ, 1322 nr->t1 / HZ, 1323 ax25_display_timer(&nr->t2timer) / HZ, 1324 nr->t2 / HZ, 1325 ax25_display_timer(&nr->t4timer) / HZ, 1326 nr->t4 / HZ, 1327 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1328 nr->idle / (60 * HZ), 1329 nr->n2count, 1330 nr->n2, 1331 nr->window, 1332 sk_wmem_alloc_get(s), 1333 sk_rmem_alloc_get(s), 1334 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1335 1336 bh_unlock_sock(s); 1337 } 1338 return 0; 1339} 1340 1341static const struct seq_operations nr_info_seqops = { 1342 .start = nr_info_start, 1343 .next = nr_info_next, 1344 .stop = nr_info_stop, 1345 .show = nr_info_show, 1346}; 1347 1348static int nr_info_open(struct inode *inode, struct file *file) 1349{ 1350 return seq_open(file, &nr_info_seqops); 1351} 1352 1353static const struct file_operations nr_info_fops = { 1354 .owner = THIS_MODULE, 1355 .open = nr_info_open, 1356 .read = seq_read, 1357 .llseek = seq_lseek, 1358 .release = seq_release, 1359}; 1360#endif /* CONFIG_PROC_FS */ 1361 1362static const struct net_proto_family nr_family_ops = { 1363 .family = PF_NETROM, 1364 .create = nr_create, 1365 .owner = THIS_MODULE, 1366}; 1367 1368static const struct proto_ops nr_proto_ops = { 1369 .family = PF_NETROM, 1370 .owner = THIS_MODULE, 1371 .release = nr_release, 1372 .bind = nr_bind, 1373 .connect = nr_connect, 1374 .socketpair = sock_no_socketpair, 1375 .accept = nr_accept, 1376 .getname = nr_getname, 1377 .poll = datagram_poll, 1378 .ioctl = nr_ioctl, 1379 .listen = nr_listen, 1380 .shutdown = sock_no_shutdown, 1381 .setsockopt = nr_setsockopt, 1382 .getsockopt = nr_getsockopt, 1383 .sendmsg = nr_sendmsg, 1384 .recvmsg = nr_recvmsg, 1385 .mmap = sock_no_mmap, 1386 .sendpage = sock_no_sendpage, 1387}; 1388 1389static struct notifier_block nr_dev_notifier = { 1390 .notifier_call = nr_device_event, 1391}; 1392 1393static struct net_device **dev_nr; 1394 1395static struct ax25_protocol nr_pid = { 1396 .pid = AX25_P_NETROM, 1397 .func = nr_route_frame 1398}; 1399 1400static struct ax25_linkfail nr_linkfail_notifier = { 1401 .func = nr_link_failed, 1402}; 1403 1404static int __init nr_proto_init(void) 1405{ 1406 int i; 1407 int rc = proto_register(&nr_proto, 0); 1408 1409 if (rc != 0) 1410 goto out; 1411 1412 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1413 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1414 return -1; 1415 } 1416 1417 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1418 if (dev_nr == NULL) { 1419 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1420 return -1; 1421 } 1422 1423 for (i = 0; i < nr_ndevs; i++) { 1424 char name[IFNAMSIZ]; 1425 struct net_device *dev; 1426 1427 sprintf(name, "nr%d", i); 1428 dev = alloc_netdev(0, name, nr_setup); 1429 if (!dev) { 1430 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1431 goto fail; 1432 } 1433 1434 dev->base_addr = i; 1435 if (register_netdev(dev)) { 1436 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1437 free_netdev(dev); 1438 goto fail; 1439 } 1440 nr_set_lockdep_key(dev); 1441 dev_nr[i] = dev; 1442 } 1443 1444 if (sock_register(&nr_family_ops)) { 1445 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1446 goto fail; 1447 } 1448 1449 register_netdevice_notifier(&nr_dev_notifier); 1450 1451 ax25_register_pid(&nr_pid); 1452 ax25_linkfail_register(&nr_linkfail_notifier); 1453 1454#ifdef CONFIG_SYSCTL 1455 nr_register_sysctl(); 1456#endif 1457 1458 nr_loopback_init(); 1459 1460 proc_net_fops_create(&init_net, "nr", S_IRUGO, &nr_info_fops); 1461 proc_net_fops_create(&init_net, "nr_neigh", S_IRUGO, &nr_neigh_fops); 1462 proc_net_fops_create(&init_net, "nr_nodes", S_IRUGO, &nr_nodes_fops); 1463out: 1464 return rc; 1465fail: 1466 while (--i >= 0) { 1467 unregister_netdev(dev_nr[i]); 1468 free_netdev(dev_nr[i]); 1469 } 1470 kfree(dev_nr); 1471 proto_unregister(&nr_proto); 1472 rc = -1; 1473 goto out; 1474} 1475 1476module_init(nr_proto_init); 1477 1478module_param(nr_ndevs, int, 0); 1479MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1480 1481MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1482MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1483MODULE_LICENSE("GPL"); 1484MODULE_ALIAS_NETPROTO(PF_NETROM); 1485 1486static void __exit nr_exit(void) 1487{ 1488 int i; 1489 1490 proc_net_remove(&init_net, "nr"); 1491 proc_net_remove(&init_net, "nr_neigh"); 1492 proc_net_remove(&init_net, "nr_nodes"); 1493 nr_loopback_clear(); 1494 1495 nr_rt_free(); 1496 1497#ifdef CONFIG_SYSCTL 1498 nr_unregister_sysctl(); 1499#endif 1500 1501 ax25_linkfail_release(&nr_linkfail_notifier); 1502 ax25_protocol_release(AX25_P_NETROM); 1503 1504 unregister_netdevice_notifier(&nr_dev_notifier); 1505 1506 sock_unregister(PF_NETROM); 1507 1508 for (i = 0; i < nr_ndevs; i++) { 1509 struct net_device *dev = dev_nr[i]; 1510 if (dev) { 1511 unregister_netdev(dev); 1512 free_netdev(dev); 1513 } 1514 } 1515 1516 kfree(dev_nr); 1517 proto_unregister(&nr_proto); 1518} 1519module_exit(nr_exit); 1520